libcmd/common/cmd.h

	cmd.h revision 7c2fbfb345896881c631598ee3852ce9ce33fb07
/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1992-2008 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * AT&T Research
 *
 * builtin cmd definitions
 */

#ifndef _CMD_H
#define _CMD_H

#include <ast.h>
#include <error.h>
#include <stak.h>
#include <shcmd.h>

#define cmdinit         _cmd_init

#if _BLD_cmd && defined(__EXPORT__)
#define extern      __EXPORT__
#endif

#include <cmdext.h>

#undef  extern

#if defined(CMD_BUILTIN) && !defined(CMD_STANDALONE)
#define CMD_STANDALONE  CMD_BUILTIN
#endif

#ifdef CMD_STANDALONE

#define CMD_CONTEXT(c)      ((Shbltin_t*)0)

#if CMD_DYNAMIC

#include <dlldefs.h>

typedef int (*Shbltin_f)(int, char**, void*);

#else

extern int CMD_STANDALONE(int, char**, void*);

#endif

#ifndef CMD_BUILTIN

/*
 * command initialization
 */

static int
cmdinit(int argc, register char** argv, void* context, const char* catalog, int flags)
{
    register char*  cp;
    register char*  pp;

    if (cp = strrchr(argv[0], '/'))
        cp++;
    else
        cp = argv[0];
    if (pp = strrchr(cp, '_'))
        cp = pp + 1;
    error_info.id = cp;
    if (!error_info.catalog)
        error_info.catalog = (char*)catalog;
    opt_info.index = 0;
    if (context)
        error_info.flags |= flags;
    return 0;
}

#endif

int
main(int argc, char** argv)
{
#if CMD_DYNAMIC
    register char*  s;
    register char*  t;
    void*       dll;
    Shbltin_f   fun;
    char        buf[64];

    if (s = strrchr(argv[0], '/'))
        s++;
    else if (!(s = argv[0]))
        return 127;
    if ((t = strrchr(s, '_')) && *++t)
        s = t;
    buf[0] = '_';
    buf[1] = 'b';
    buf[2] = '_';
    strncpy(buf + 3, s, sizeof(buf) - 4);
    buf[sizeof(buf) - 1] = 0;
    if (t = strchr(buf, '.'))
        *t = 0;
    for (;;)
    {
        if (dll = dlopen(NiL, RTLD_LAZY))
        {
            if (fun = (Shbltin_f)dlsym(dll, buf + 1))
                break;
            if (fun = (Shbltin_f)dlsym(dll, buf))
                break;
        }
        if (dll = dllfind("cmd", NiL, RTLD_LAZY))
        {
            if (fun = (Shbltin_f)dlsym(dll, buf + 1))
                break;
            if (fun = (Shbltin_f)dlsym(dll, buf))
                break;
        }
        return 127;
    }
    return (*fun)(argc, argv, NiL);
#else
    return CMD_STANDALONE(argc, argv, NiL);
#endif
}

#else

#undef  cmdinit
#ifdef _MSC_VER
#define CMD_CONTEXT(p)      ((Shbltin_t*)(p))
#define cmdinit(a,b,c,d,e)  do{if(_cmd_init(a,b,c,d,e))return -1;}while(0)
#else
#define CMD_CONTEXT(p)      (((p)&&((Shbltin_t*)(p))->version>=20071012&&((Shbltin_t*)(p))->version<20350101)?((Shbltin_t*)(p)):0)
#define cmdinit(a,b,c,d,e)  do{if((c)&&!CMD_CONTEXT(c))c=0;if(_cmd_init(a,b,c,d,e))return -1;}while(0)
#endif

#if _BLD_cmd && defined(__EXPORT__)
#define extern          extern __EXPORT__
#endif

extern int  _cmd_init(int, char**, void*, const char*, int);

#undef  extern

#endif

#endif